/**
 * Copyright (c) 2010, Casey Lai
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 * 
 * Neither the name of the Cheetah Group nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

package org.cheetahworkflow.engine;

import java.util.Iterator;
import java.util.List;

/**
 * workflow node entry for switch node
 * @author caseylai
 * @param <T> context
 */
public class SwitchNodeEntry<T> implements WorkflowNodeEntry<T> {
	
	private String switchNodeName;
	
	private WorkflowConfigure<T> config;
	
	private List<SwitchDefine<T>> defines;
	
	SwitchNodeEntry(String switchNodeName, WorkflowConfigure<T> config, List<SwitchDefine<T>> defines) {
		this.switchNodeName = switchNodeName;
		this.config = config;
		this.defines = defines;
	}

	/**
	 * traverse all the conditions, once one condition is judged true,
	 * then turn to the condition's corresponding next node.
	 * If all the conditions are judged false, throw WorkflwoException 
	 */
	@Override
	public WorkflowNodeEntry<T> exec(T context) {
		Iterator<SwitchDefine<T>> it = defines.iterator();
		while (it.hasNext()) {
			SwitchDefine<T> define = it.next();
			if (define.getCondition().test(context)) {
				return config.getEntry(define.getNextNodeName());
			}
		}
		throw new WorkflowException("No switch condition is matching: " + switchNodeName);
	}
}
